Telegraph-sounder.



No. 650,836. I Patented lun'e"5, 19.00.

F. HATMAKER.

TELEGRAPH SOUN-DER.

(Application filed July 815-1899.)

(No Model.)

. lJNiTnD STATES ATENT O F C FRANCIS IIATMAKER, or PITTSTON, PENNSYLVANIA.

TELEGRAPH-SOUNDER.

SPECIFICATION forming part of Letters Patent No. 650,836, dated June 5, 1900.

Application filed July 31,1899. Serial No. 72'5J669i (N0 model.)

To all 1012,0111, it may concern:

Be it known that I, FRANCIS l-IATMAK'ER, a citizen of the United States, residing at Pittston, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in TelegraphSou'nders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in telegraph-sounders, and one of the objects is to produce a clearer and more audible sound.

Another obj eat is to produce adevice of this class with few parts and otherwise simple in construction and generally to promote the durability of the instrument.

A further object is to provide the instrument with an improved tension device for the armature-lever which will permit a quick and accurate adjustment thereof.

With these and other objects and advantages in view the invention consists of certain novel and useful combinations and arrangements of parts, described in the following specification, and particularly pointed out in the claims appended thereto.

In the drawings accompanying this specification and illustrating my invention, Figure 1 is a side elevation of the improved telegraph-sounder. Fig. 2 is a rear elvation thereof. Fig. 3 is a detail view. Fig. 4 is a sectional view of a modified form of base; Fig. 5, detail views of modified form of baselegs.

Like letters of reference denote like parts throughout the several figures of the drawings.

A is the base of the sounder, which is preferably constructed of metal to prevent cracking when secured to a table or other support. It is provided with a rear leg and two forward ones. Ascrew-hole is also provided whereby the said base may be fastened in position At each rear corner is a binding-post A, provided with the usual clamp member a, and said binding-post is secured to the base by the threaded bolt a, which passes through the post, with an upper projection for the clamp member cyand a lower projection which passes through a perforation or opening-a in th'ebase. It is insulated therefrom by upper and lower washers a? and a of rub-1 her or any other suitable insulating material, 5 5

and the gasket c of similar insulating ma vterial, which may be formed integral with the'upper washer a This gasket surrounds the bolt where 'it passes through the base.. The washer (Wand nut a fasten the bindingpost in place.

Secured upon the base A,with a between, isa sounding-plate B, which is rendered free to vibrate by having one point of space therecontact with the base at its front, the washer b, and two points of contactat the rear, one each corner bb. These washers,or more prop erly spacing-sleeves, surround the screws which secure the sounding-plate to the base."

Upon this plateB is mounted the usual sound ing-post O, which is provide'd'with the usual magnets are electrically connected to the These connections trunnions d d or may be a shaft a short dis- 7 tance from the rear thereof, which are pivotally mounted in a yoke F by the countersunk screws f f, passing through opposite sides of the yoke horizontally and engaging with sockets in the ends of the trunnions. This yoke is supported upon a standard F, with which it may be formed integral, and the foot of said standard is reduced and squared, as at f, and stepped in a square opening in the sounding-plate B. This prevents the yoke from being turned in its place, as would be the case were the opening and foot round, with constant vibrations of the armature-lever acting thereupon. Below the soundingplate the foot is further reduced and screwthreaded to receive afastening-nut f ,-whioliarm or branch of this spring may be secured to the under side of the rear end of the armature-lever D by any fastening meanssuch, for example, as a screw-or it may be secured to any side of the said lever or it may be inserted in the end thereof, which maybe split or slitted for that purpose. The other branch of the bowed spring is bent upwardly at right angles, as at g, and a perforation 9' made therein to pass over a threaded adjustingbolt 9 which passes horizontally through the top of the yoke. The perforation g is larger than the diameter of the bolt, and on the end of the latter, retaining the end of the spring in place, is a square nut 9 which is large enough to abutagainst the bow of the spring and not turn with the bolt. By this means the bolt can be manipulated to increase or diminish the tension of the lower arm of the spring by shortening or lengthening the said arm, and thereby to accurately regulate the resistance to the contrary force exercised by the magnets upon the armature when the circuit is made. By securing one branch of this bowed spring fast to the top of the yoke and securing the other branch to the under side of the end of the armature-lever in the abovedescribed adjustable manner the same nicety of regulation of the resistance will be obtained.

I may employ a modified form of base, as seen in Fig. 4. Here the base [I may be formed of thin sheet metal, as brass, and separate legs of tubing-sections, as h, employed to raise said base from the supporting-table X. Screws h are passed down through the base and tube legs h and into the table, or I may employ separate legs, made of wire, in the shapes illustrated in Fig. 5, ha, which serve to raise the base above the table, and screws h are passed down therethrough the same as with the legs made of tube-sections.

what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a base and suitable electrical connections, a sounding-post, magnets, an armature and armature-lever pivotally supported in position, of an adj ustable tension device for said lever, consisting of abowed spring connected to the levcr and to the lever-support, and means for varying the length of: the arm of the spring, connected to the lever, to regulate the tension on the end of the same.

2. The combination with a base, and suitable electrical connections, a sounding-post, magnets, an armature and armature-lever pivotally supported in position, of a tension device for said lever, consisting of a bowed spring connected to the lever and means for varying the length of the arm of the spring connected to the lever, comprising a threaded adjusting-bolt passing through an opening in the yoke and an opening in the free arm of the spring, and a retaining-nut on the end of said bolt, held against rotation by contact with the arm of said spring.

In testimony whereof I affix my signature in presence of two Witnesses.

FRANCIS IIA'IMAKER.

Vitnesscs:

CHARLES P. BOHAN, FAY O. MITCHELL. 

